RU148801U1 - DEVICE FOR MEASURING THE LEVEL IN A HEAT EXCHANGER - Google Patents

Abstract

A device for measuring the level in a heat exchanger, including a condensation tank body connected by a steam pipe to the steam space of the heat exchanger body, and a water discharge pipe with a separation pressure sensor connected to a level sensor and a water space of the heat exchanger body, characterized in that the upper part the casing and the lid of the tank is made integral, while the inner generatrix of the lid and the steam pipe are located at the same level, and the inner diameter of the steam pipe ka greater than the internal diameter of the drainage pipe.

Description

The utility model relates to the field of power engineering and can be used in the chemical and energy industries to measure the liquid level in heat exchangers, for example, high and low pressure heaters of a steam turbine regeneration system.

A device for measuring the level, made in the form of a condensation tank with nozzles connected in the steam part to the heat exchanger, and on the other through the impulse line to the water part of the heat exchanger ("Heat exchange equipment of steam turbine plants. Industry catalog, part II" M., Ministry heavy power and transport engineering of the USSR, 1989, p. 8).

The disadvantage of this device for measuring the level is the possibility of false triggering of the protection in the heat exchanger due to the level increase during sharply variable operating modes due to the delayed measurement of pressure in the vapor space of the condensation tank.

A device for measuring the level in a heat exchanger is known, including a condensation tank casing connected by nozzles on one side to the steam space of the heat exchanger casing and, on the other, with a separation pressure sensor (RTM 108.271.23-84 “Calculation and design of surface heaters high and low pressure, L., NPO CKTI, 1987, p. 48).

By the totality of the features, this known technical solution is the closest to the claimed one and is taken as a prototype.

A disadvantage of the known device adopted for the prototype is the insufficient inner diameter of the steam pipe connecting the steam housing of the heat exchanger with the condensation tank, which leads to the protection triggering a false level increase due to a delayed pressure change in the "positive" line with a rapid change in steam pressure in the housing. As well as limiting the rate of increase (decrease) in pressure in heat exchangers of high pressure to 0.6 (kg / cm ² ) / min (according to the emergency circular ПЦ №Т-2/73 “On preventing accidents of high-pressure heaters TKZ type PV due to destruction of the pipe system ”(M .: SCSTI ORGRES, 1973).

The analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information, as well as identification of sources containing information about analogues of the claimed utility model, allowed to establish that the applicant did not find a technical solution characterized by signs identical or equivalent to those proposed. However, the proposed technical solution does not follow explicitly for the specialist in the manner of the prior art and determined by the applicant.

The determination from the list of identified analogues of the prototype as the closest technical solution for the totality of features made it possible to identify in the claimed device a combination of significant distinctive features in relation to the technical result perceived by the applicant, as set forth in the utility model below.

The claimed technical solution allows to increase the accuracy and reliability of measurements, to avoid false alarms of the protection of heat exchangers, as well as to increase the rate of change of pressure in the steam space of the heater and, thereby, increase the rate of change of the load of the turbine, that is, increase its maneuverability without false operation of the protections.

A device for measuring the level in a heat exchanger is proposed, including a condensation tank body connected by a steam pipe to the steam space of the heat exchanger body, and a water discharge pipe with a separation pressure sensor connected to the level sensor and the water space of the heat exchanger body, and the upper part the casing and the lid of the tank is made whole, the inner forming lids and the steam nozzle are located at the same level, and the inner diameter of the steam nozzle is larger the inner diameter of the water outlet pipe.

The device is illustrated in the drawing, which shows:

- in FIG. 1 - general view of the device;

- in FIG. 2 is a view A of FIG. one.

A device for measuring the level in a heat exchanger includes a condensation tank 1 body connected by a steam pipe 2 to the steam space of the heat exchanger body 3, and by means of a water discharge pipe 4, with a separation pressure sensor 5 connected to a level sensor 6 and the water space of the heat exchanger body 7 . Moreover, the upper part of the housing 8 and the lid of the tank 9 is made integral. The inner generatrix of the cover 9 and the steam pipe 2 are located at the same level. The inner diameter of the steam pipe 2 is larger than the internal diameter of the water discharge pipe 4, which is connected to the pipeline 10. To remove air on the back bottom 8 of the condensation tank 1 is a plug 11.

A device for measuring the level works as follows.

When the heat exchanger is operating in static mode, the level measuring device through the pipe 2 connected to the steam part of the heat exchanger 3 is filled with steam, and on the other hand, through the water discharge pipe 4 connected to the pipeline 10 and the separation pressure sensor 5, it is filled with water with the body’s water space heat exchanger 7. The design of the separation pressure sensor 5 includes a separation membrane, which in static mode is balanced by the pressure of the medium and the hydrostatic column liquids. The signal from the separation pressure sensor 5 is fed to the level sensor 6 and then to the protection and regulation system. When changing the vapor pressure in the heat exchanger 3, for example, when it increases, the pressure of steam and water in the casing of the heat exchanger increases from the steam 3 and water 7 sides. In the water space of the body of the condensation tank 1, the water pressure through the pipeline 10 and the separation pressure sensor 5 is aligned with the vapor pressure in the body of the heat exchanger 3 without lag. And in the vapor space of the condensation tank 1, the vapor pressure may lag behind the pressure increase in the heat exchanger 3 due to the compressibility of the steam and its condensation in the upper part of the condensation tank 1. This leads to false readings of the level in the heat exchanger 3, due to an incorrect signal from the separation sensor pressure 5 and level sensor 6. When performing the inner generatrix of the cover 9 and the inner generatrix of the steam pipe 2 at the same level, there is no space filled with steam in the body of the condensation tank 1 m, and the compressibility of vapor and condensation does not affect the level of evidence. Also, due to the difference in the densities of steam and water, it is necessary to ensure the inner diameter of the steam pipe 2 is larger than the internal diameter of the pipe for water drain 4, which will ensure that there is no delay.

Claims (1)

A device for measuring the level in a heat exchanger, including a condensation tank body connected by a steam pipe to the steam space of the heat exchanger body, and a water discharge pipe with a separation pressure sensor connected to a level sensor and a water space of the heat exchanger body, characterized in that the upper part the body and the lid of the tank is made integral, while the inner forming lids and the steam pipe are located at the same level, and the inner diameter of the steam pipe ka greater than the internal diameter of the drainage pipe.

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